Steam-boiler furnace.



P. DURAN.

STEAM BOILER FURNACE.

AYPLIOATION FILED MAR.1,1909.

Patented Mar.29, 1910.

lmi'enior i I 7 2/ 1 I PATRICK DORAN, OF QUEBEC, QUEBEC, CANADA.

STEAM-BOILER FURNACE.

Specification of Letters Patent.

Patented Mar. 29, 1910.

Application filedllarch 1,1909, Serial No. 480,647.

To all whom it may concern:

Be it known that I, PATRICK DORAN, a citizen of the United States of America, residin at 48 Conroy street, in the city of Que co, in the Province of Quebec, in the Dominion of- Canada, have invented certain new and useful Improvements in Steam-Boiler Furnaces; declare that the followin 'is a full, clear, and exact description of t e same.

The invention relates to improvements in steam boiler furnaces, as described in. the present specification and illustrated in the accompanying drawingsthat form part of the. same.

The invention consists essentially in the novel arran ement; "andconstruction of and I do hereby parts, where y a forced draft emanating from a compressed air reservoir. reaches the. fire box through the stay bolts supporting the floor of the fire box, the fuel resting directly on said floor and whereby the gases are retained in the said fire box. by a suitable stop on a central flue during the consumption oft'he smoke.

The objects of the invention are to economize in the consumption of fuel, to devise a ing 6 immediately above the su stantially Referring to the drawings 1 is the fire box here shown as having. the customary door opening 2 and door 3 and the flue o ening 4 from therear wall thereof, said box a so havingfithe ash door 5 closin the opensolid fioorin and fuel support 7 and said floorin or 1516]. support having a plurality of air oles 8 therethrough.

9is the shell of a steam boiler, in which the fire box is shown as contained, said fire box 1 being rigidly secured centrally towardone end of said boiler by the stay 'cularly applicable to marine bolts 10 and 11, the stay bolts- 11 are shown 1n plurality extending upwardly and through the boiler shell and are of tubular construction, so that there is a clear passage.

12 are branch pipes leading to the several tubular stay bolts 11 from the main supply pi e 13, the latter leading from a compresse air reservoir, thus a forced draft by means of the compressed air can be sent into the fire box from the compressed air reservoir through or around the stay bolts 11.

14 is a flue longitudinally arranged within the shell 9 and extendin from the flue opening 4 centrally throu h the head 15, closing in the end of the shell 9, said shell being closed at the other end by the head 16, in which is the door opening to which the doors 3 and 5 are attached.

17 and 18 are passages formed between the head 16 and the fire box 1, the latter being well within the inner boiler shell 9 so as to form a complete water space around said fire box, the stay bolts 10 and 11 spacing said fire box from said shell at the top, bottom and sides.

19 is the middle shell encircling the shell 9 and spaced therefrom by the stay bolts 20 forming the heating gas space 21 and extendin from the head 16 to the head 22, the latter eing beyond the head 15.

23 is an outlet from the inner end of the space21 having a pipe 24; leading therefrom, said pipe being connected to a distributing pipe 25.

26 is the outer shell suitably spaced from the middle shell 19 by the stay bolts 27 form- -'ing a water jacket 28, said outer shell 26 ex- =tending from the head 16 to the head 29, the latter being beyond the head 22.

30 is a stop closing the flue opening in the head 15.

31 is a threaded spindle secured to the stop 30 and extending outwardly through the middle and outer shell within a suitable block 32.

33 is a hand wheel having a correspondingly threaded hub to the spindle 31 and turning thereon and adapted on rotation to open or close the st0p30. Y

It will be thus seen that the flue 14 may be 0 ened and closed according to the state of e fire in the fire box, thus retaining any fouling gases passing into the space 14 or therebeyond before they are consumed in the fire box.

3 1 is a steam dome receiving the steam from the boiler.

35 is a safety valve.

36 is a steam chest receiving the steam from the water jacket 28.

In the operation of this furnace, the firing up of the furnace is accelerated by a blow lamp, thus the fuel reaches its state of incandescence in a comparatively short time, consequently the air which has been turned on through the branch pipes; 12 mixes with the gases and is consumed thereby aiding in the combustion-of said fuel, as well as creating a forced draft in the fire box. The heating gases flow through the flue and opening therefrom to the space 21 encircling the boiler and completely envelop the water 'in said boiler, consequently there is an inner and outer heating surface which very rapidly generates steam, the heating gases proceedmg in their flow further from said space through the pipe 24 into the distributing pipe 25.

V. In "this invention, the arrangement of the furnace is, of course, the salientfeature, that is the furnace, the flues and the heating spaces, and with modifications it can be used for various purposes such as for blast furnaces and all kinds of melting furnaces, but the particular purpose and form described herein is the most useful as it is very applicable to marine boilers in sea going vessels where the salt water can be pumped into the water jacket and steam generated therefrom and said steam condensed and returned to 'the main boiler in the form of water.

a flue extending secured tothe end having an outlet beyond said stop and flue, means for o ening and closing the said stop,

' and a pipe eading from outlet of said heating space.

2. In a steam boller furnace, a fire box, a casing inclosing said fire box and havingan extending portion therefrom, a flue proj ecting from saidfire box within the extending portion of saidcasing, a stop secured on the end of said flue, means for opening and closing said stop, a plurality of stay bolts spacing said fire box from sa1d casing, a plurality of tubular members forming stay bolts and air passages into said fire box,acompressed air reservoir suitably connected to said tubular members, and a plurality of shells inclosing a portion of the aforesaid casing and forming a heating gas chamber, and an auxiliary chamber for substances to be heated.

3. In a device of the class described, in combination, an inner, amiddle and an outer shell suitably spaced apart forming a water boiler, a heating gas space and a waterj'acket in the spaces Within and therebetween, a fire box having a substantially solid flooring or fuel support, a plurality of hollow stay bolts leading from said innershell to the bottom of said fire box-and forming-passages thereinto and spacing said fire box from said" inner shell, said fire box having an ash door opening adjacent to the flooring thereof and a fuel opening thereabove, a plurality of pipes leading to said hollow stay bolts, an

air reservoir suitably connected to said pipes.

a flue leading from said fire box centrally and longitudinally through said water boiler, a stop at the end of said flue, emeans for opening and closing said stop and a distributing pipe leading from said heating gas space. r

Signed at the city and district of Montreal, in the Province of Quebec, in the Dominion of Canada, this 17th day of Febru- PATRICK DORAN.

Witnesses:

G. H. TRESIDDER, P. SHEE. 

